msan, codegen, instcombine: Keep more lifetime markers used for msan

Reviewers: eugenis

Subscribers: hiraditya, cfe-commits, #sanitizers, llvm-commits

Tags: #clang, #sanitizers, #llvm

Differential Revision: https://reviews.llvm.org/D66695

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@369979 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 18 insertions, 0 deletions

diff --git a/test/msan/loop-scope.cpp b/test/msan/loop-scope.cpp
new file mode 100644
index 000000000..638bdbe17
--- /dev/null
+++ b/test/msan/loop-scope.cpp
@@ -0,0 +1,18 @@
+// RUN: %clangxx_msan -O2 %s -o %t && \
+// RUN:     not %run %t 2>&1 | FileCheck %s
+
+#include <stdlib.h>
+
+int *p;
+
+int main() {
+  for (int i = 0; i < 3; i++) {
+    int x;
+    if (i == 0)
+      x = 0;
+    p = &x;
+  }
+  return *p; // BOOM
+  // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
+  // CHECK:  #0 0x{{.*}} in main {{.*}}loop-scope.cpp:[[@LINE-2]]
+}